One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(5,6)(7,8)(11,15)(13,16)(17,18)(19,28)(20,24)(21,27)(22,26)(23,30)(25,29)(31,32)(9,10,12,14)(11,16,15,13)(17,19,20,30,21,31,22,29)(18,23,26,28,27,25,24,32)(2,4)(9,11,12,15)(10,13,14,16)(17,20,21,22)(18,24,27,26)(19,29,31,30)(23,28,25,32)(6,8)(17,19,20,30,21,31,22,29)(18,25,26,32,27,23,24,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.